Note that NASA had nothing to do with these recordings. The original version of these were produced by a chiropractor, Jeffrey Thompson, who was interested in marketing "therapeutic audio" through his company Brain/Mind Research. He obtained recordings that were publicly available from the Voyager PWS (plasma wave) researchers, and some of these were likely mixed into his products. However, the final results sound essentially nothing like the original natural signals. Of course there is nothing wrong with using these public domain data in creative works, but it was more than a little misleading to suggest that they represented the unmodified Voyager plasma wave recordings.
A complete set of the natural Voyager data converted to audio files is available on the web from the PWS research team at The University of Iowa. The unmodified Voyager audio occurs in 48-second segments that are quite a challenge to sift through to find interesting bits. The natural audio tends to be far less interesting, less soothing, and less marketable than these products.
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